drm/dp_mst: Check payload count in drm_dp_mst_atomic_check()

It occurred to me that we never actually check this! So let's start
doing that.

Signed-off-by: Lyude Paul <lyude@redhat.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: David Airlie <airlied@redhat.com>
Cc: Jerry Zuo <Jerry.Zuo@amd.com>
Cc: Harry Wentland <harry.wentland@amd.com>
Cc: Juston Li <juston.li@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190111005343.17443-20-lyude@redhat.com

diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c
index 88db6d7..196ebba 100644 (file)
--- a/drivers/gpu/drm/drm_dp_mst_topology.c
+++ b/drivers/gpu/drm/drm_dp_mst_topology.c
@@ -3641,7 +3641,7 @@ drm_dp_mst_atomic_check_topology_state(struct drm_dp_mst_topology_mgr *mgr,
                                       struct drm_dp_mst_topology_state *mst_state)
 {
        struct drm_dp_vcpi_allocation *vcpi;
-       int avail_slots = 63;
+       int avail_slots = 63, payload_count = 0;
 
        list_for_each_entry(vcpi, &mst_state->vcpis, next) {
                /* Releasing VCPI is always OK-even if the port is gone */
@@ -3661,6 +3661,12 @@ drm_dp_mst_atomic_check_topology_state(struct drm_dp_mst_topology_mgr *mgr,
                                         avail_slots + vcpi->vcpi);
                        return -ENOSPC;
                }
+
+               if (++payload_count > mgr->max_payloads) {
+                       DRM_DEBUG_ATOMIC("[MST MGR:%p] state %p has too many payloads (max=%d)\n",
+                                        mgr, mst_state, mgr->max_payloads);
+                       return -EINVAL;
+               }
        }
        DRM_DEBUG_ATOMIC("[MST MGR:%p] mst state %p VCPI avail=%d used=%d\n",
                         mgr, mst_state, avail_slots,